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https://www.readbyqxmd.com/read/28722486/neurotoxic-effects-of-subchronic-intratracheal-mn-nanoparticle-exposure-alone-and-in-combination-with-other-welding-fume-metals-in-rats
#1
Zsuzsanna Máté, Edina Horváth, András Papp, Krisztina Kovács, Etelka Tombácz, Dániel Nesztor, Tamás Szabó, Andrea Szabó, Edit Paulik
Manganese (Mn) is a toxic heavy metal exposing workers in various occupational settings and causing, among others, nervous system damage. Metal fumes of welding, a typical source of Mn exposure, contain a complex mixture of metal oxides partly in nanoparticle form. As toxic effects of complex substances cannot be sufficiently understood by examining its components separately, general toxicity and functional neurotoxicity of a main pathogenic welding fume metal, Mn, was examined alone and combined with iron (Fe) and chromium (Cr), also frequently found in fumes...
July 19, 2017: Inhalation Toxicology
https://www.readbyqxmd.com/read/28712470/field-proteomics-of-populus-alba-grown-in-a-heavily-modified-environment-an-example-of-a-tannery-waste-landfill
#2
Agnieszka Szuba, Gabriela Lorenc-Plucińska
Tannery waste is highly toxic and dangerous to living organisms because of the high heavy metal content, especially chromium [Cr(III)]. This study analysed the proteomic response of the Populus alba L. clone 'Villafranca' grown for 4years on a tannery waste landfill. In this extremely hostile environment, the plants struggled with continuous stress, which inhibited growth by 54%, with a 67% decrease in tree height and diameter at breast height compared to those of the forest reference plot, respectively. The leaves and roots of the tannery landfill-grown plants produced strong proteomic stress signals for protection against reactive oxygen species (ROS) and repair to ROS-damaged proteins and DNA as well as signals for protection of the photosynthetic apparatus...
July 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28712078/effects-based-spatial-assessment-of-contaminated-estuarine-sediments-from-bear-creek-baltimore-harbor-md-usa
#3
Sharon E Hartzell, Michael A Unger, Beth L McGee, Lance T Yonkos
Estuarine sediments in regions with prolonged histories of industrial activity are often laden to significant depths with complex contaminant mixtures, including trace metals and persistent organic pollutants. Given the complexity of assessing risks from multi-contaminant exposures, the direct measurement of impacts to biological receptors is central to characterizing contaminated sediment sites. Though biological consequences are less commonly assessed at depth, laboratory-based toxicity testing of subsurface sediments can be used to delineate the scope of contamination at impacted sites...
July 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28693103/functionalized-magnetic-iron-oxide-polyacrylonitrile-composite-electrospun-fibers-as-effective-chromium-vi-adsorbents-for-water-purification
#4
Rui Zhao, Xiang Li, Yumei Li, Yanzi Li, Bolun Sun, Nan Zhang, Shen Chao, Ce Wang
Inorganic/organic composite electrospun fibers have been extensively investigated as adsorbents for the wastewater treatment. In this study, branched polyethylenimine (b-PEI) functionalized magnetic iron oxide (Fe3O4)/polyacrylonitrile (PAN) composite electrospun fiber adsorbent (b-PEI-FePAN) was fabricated and systematically explored for the removal of toxic hexavalent chromium [Cr(VI)]. b-PEI grafted PAN organic component not only acted as the flexible substrate to load Fe3O4 particles but also made a contribution to the improved adsorption capacity...
June 29, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28683391/biodegradable-alternative-for-removing-toxic-compounds-from-sugarcane-bagasse-hemicellulosic-hydrolysates-for-valorization-in-biorefineries
#5
T Silva-Fernandes, J C Santos, F Hasmann, R C L B Rodrigues, H J Izario Filho, M G A Felipe
Among the major challenges for hemicellulosic hydrolysate application in fermentative processes, there is the presence of toxic compounds generated during the pretreatment of the biomass, which can inhibit microbial growth. Therefore, the development of efficient, biodegradable and cost-effective detoxification methods for lignocellulosic hydrolysates is crucial. In this work, two tannin-based biopolymers (called A and B) were tested in the detoxification of sugarcane bagasse hydrolysate for subsequent fermentation by Candida guilliermondii...
June 15, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28681292/biochars-mitigate-greenhouse-gas-emissions-and-bioaccumulation-of-potentially-toxic-elements-and-arsenic-speciation-in-phaseolus-vulgaris-l
#6
Muhammad Ibrahim, Gang Li, Sardar Khan, Qiaoqiao Chi, Yaoyang Xu
Anthropogenic and natural activities can lead to increased greenhouse gas emissions and discharge of potentially toxic elements (PTEs) into soil environment. Biochar amendment to soils is a cost-effective technology and sustainable approach used to mitigate greenhouse gas emissions, improve phytoremediation, and minimize the health risks associated with consumption of PTE-contaminated vegetables. Greenhouse pot experiments were conducted to investigate the effects of peanut shell biochar (PNB) and sewage sludge biochar (SSB) on greenhouse gas (GHG) emissions, plant growth, PTE bioaccumulation, and arsenic (As) speciation in bean plants...
July 5, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28675125/toxic-and-essential-metals-in-cyprinus-carpio-carassius-gibelio-and-luciobarbus-esocinus-tissues-from-keban-dam-lake-pertek-turkey
#7
Gokce Kaya, Semra Turkoglu
In various tissues of Luciobarbus esocinus, Cyprinus carpio and Carassius gibelio which were taken from Keban Dam Lake Pertek region's freshwaters, Turkey in January-February 2016, concentrations of mercury, nickel, lead, cadmium, arsenic, manganese, chromium and cobalt were analyzed by ICP-MS after microwave digestion. In fish muscle mean chromium concentration (0.614 mgkg(-1) in C. carpio muscle) was higher than the maximum limits as set by the Federal Environmental Protection Agency (2003) and World Health Organisation (1985)...
July 4, 2017: Food Additives & Contaminants. Part B, Surveillance
https://www.readbyqxmd.com/read/28665617/synthesis-of-a-multifunctional-graphene-oxide-based-magnetic-nanocomposite-for-efficient-removal-of-cr-vi
#8
Dongfang Wang, Guilong Zhang, Linglin Zhou, Min Wang, Dongqing Cai, Zhengyan Wu
A novel magnetic nanocomposite was synthesized using graphene oxide (GO), polyethylenimine (PEI), and Fe3O4 to removal hexavalent chromium (Cr(VI)) from water and soil. Therein, GO was functionalized with plenty of -NH2 by the modification of PEI through an amidation reaction, and the resulting GO/PEI reacted with FeSO4·7H2O and NaBH4 to obtain RGO/PEI/Fe3O4 (the optimal one is designated as ORPF) through an oxidation-reduction reaction. ORPF could effectively adsorb Cr(VI) through electrostatic attraction, and the adsorbed Cr(VI) ions were partially reduced to trivalent chromium (Cr(III)) with low toxicity by RGO (π electron)...
July 10, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28664715/the-history-of-arsenical-pesticides-and-health-risks-related-to-the-use-of-agent-blue
#9
Vladimir Bencko, Florence Yan Li Foong
Arsenicals in agriculture. Beginning in the 1970s, the use of arsenic compounds for such purposes as wood preservatives, began to grow. By 1980, in the USA, 70% of arsenic had been consumed for the production of wood preservatives. This practice was later stopped, due to the US Environmental Protection Agency (EPA) ban of the arsenic-and chromium-based wood preservative chromated copper arsenate. In the past, arsenical herbicides containing cacodylic acid as an active ingredient have been used extensively in the USA, from golf courses to cotton fields, and drying-out the plants before harvesting...
June 12, 2017: Annals of Agricultural and Environmental Medicine: AAEM
https://www.readbyqxmd.com/read/28660804/evaluation-of-the-molecular-mechanisms-associated-with-cytotoxicity-and-inflammation-after-pulmonary-exposure-to-different-metal-rich-welding-particles
#10
Mohammad Shoeb, Vamsi Kodali, Breanne Farris, Lindsey M Bishop, Terence Meighan, Rebecca Salmen, Tracy Eye, Jenny R Roberts, Patti Zeidler-Erdely, Aaron Erdely, James M Antonini
Welding generates a complex aerosol of incidental nanoparticles and cytotoxic metals, such as chromium (Cr), manganese (Mn), nickel (Ni), and iron (Fe). The goal was to use both in vivo and in vitro methodologies to determine the mechanisms by which different welding fumes may damage the lungs. Sprague-Dawley rats were treated by intratracheal instillation (ITI) with 2.0 mg of gas metal arc-mild steel (GMA-MS) or manual metal arc-stainless steel (MMA-SS) fumes or saline (vehicle control). At 1, 3, and 10 days, bronchoalveolar lavage (BAL) was performed to measure lung toxicity...
June 29, 2017: Nanotoxicology
https://www.readbyqxmd.com/read/28660513/the-biological-responses-and-metal-phytoaccumulation-of-duckweed-spirodela-polyrhiza-to-manganese-and-chromium
#11
Ying Liu, Tanatcha Sanguanphun, Wenqiao Yuan, Jay J Cheng, Metha Meetam
The phytoaccumulation ability of duckweed Spirodela polyrhiza on manganese (Mn) and chromium (Cr) was assessed by exposing the plant to various concentrations of single or dual metals (5-70 mg L(-1) Mn, 2-12 mg L(-1) Cr(VI)) under laboratory conditions. The results showed that S. polyrhiza can tolerate Mn at high concentrations of up to 70 mg L(-1), and its growth rate was barely affected by Mn. The effects of Cr on S. polyrhiza growth were dose-dependent, and the growth was completely inhibited in the presence of 12 mg L(-1) Cr...
June 28, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28655661/chitosan-supramolecularly-cross-linked-with-trimesic-acid-facile-synthesis-characterization-and-evaluation-of-adsorption-potential-for-chromium-vi
#12
Ronak Bhatt, B Sreedhar, P Padmaja
A facile synthesis of Chitosan Supramolecularly cross-linked with Trimesic Acid (CTMA) is reported in this work. The adsorption potential of CTMA for removal of hexavalent chromium was evaluated and the influence of pH, temperature, contact time and adsorbent dose on the adsorption process was investigated. The experimental results showed that CTMA could efficiently adsorb Cr(6+) and partially reduce it to the less toxic Cr(3+) state. The maximum adsorption capacity of CTMA for Cr(6+) was found to be 129.53mg/g at pH 2...
June 24, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28654883/removal-of-chromium-vi-from-aqueous-solutions-using-surface-modified-composite-nanofibers
#13
Alaa Mohamed, W S Nasser, T A Osman, M S Toprak, M Muhammed, A Uheida
A novel material composite nanofibers (PAN-CNT/TiO2-NH2) based on adsorption of Cr(VI) ions, was applied. Polyacrylonitrile (PAN) and carbon nanotube (CNTs)/titanium dioxide nanoparticles (TiO2) functionalized with amine groups (TiO2-NH2) composite nanofibers have been fabricated by electrospinning. The nanostructures and the formation process mechanism of the obtained PAN-CNT/TiO2-NH2 composite nanofibers are investigated using FTIR, XRD, XPS, SEM, and TEM. The composite nanofibers were used as a novel adsorbent for removing toxic chromium Cr(VI) in aqueous solution...
June 20, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28654788/highly-selective-and-efficient-removal-of-arsenic-v-chromium-vi-and-selenium-vi-oxyanions-by-layered-double-hydroxide-intercalated-with-zwitterionic-glycine
#14
Hamid Asiabi, Yadollah Yamini, Maryam Shamsayei
In this study, a new strategy for highly selective and extremely efficient removal of toxic oxyanions (Cr(VI), Se(VI), and As(V)) from aqueous solutions using zwitterionic glycine intercalated layered double hydroxide (Gly-LDH) was reported. Hence, to investigate the effect of zwitterionic glycine on the adsorption capacity, selectivity factor and adsorption mechanism of LDHs, two NiAl LDHs intercalated with different inter-layer anions, including NO3(-) and glycine, were synthesized. The obtained results show that the adsorption capacity and selectivity factor of oxyanions through ion exchange mechanism in NO3-LDH is lower than Gly-LDH...
June 21, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28645012/associations-between-toxic-and-essential-trace-elements-in-maternal-blood-and-fetal-congenital-heart-defects
#15
Yanqiu Ou, Michael S Bloom, Zhiqiang Nie, Fengzhen Han, Jinzhuang Mai, Jimei Chen, Shao Lin, Xiaoqing Liu, Jian Zhuang
Prenatal exposure to toxic trace elements, including heavy metals, is an important public health concern. Few studies have assessed if individual and multiple trace elements simultaneously affect cardiac development. The current study evaluated the association between maternal blood lead (Pb), cadmium (Cd), chromium (Cr), copper (Cu), mercury (Hg), and selenium (Se) levels and congenital heart defects (CHDs) in offspring. This hospital-based case-control study included 112 case and 107 control infants. Maternal peripheral blood draw was made during gestational weeks 17-40 and used to determine trace element levels by inductively coupled plasma mass spectrometry...
June 20, 2017: Environment International
https://www.readbyqxmd.com/read/28643849/prevalence-of-exposure-of-heavy-metals-and-their-impact-on-health-consequences
#16
Kanwal Rehman, Fiza Fatima, Iqra Waheed, Muhammad Sajid Hamid Akash
Even in the current era of growing technology, the concentration of heavy metals present in drinking water is still not within the recommended limits as set by the regulatory authorities in different countries of the world. Drinking water contaminated with heavy metals namely; arsenic, cadmium, nickel, chromium, mercury, chromium, zinc and lead is becoming a major health concern for public and health care professionals. Occupational exposure to heavy metals is known to occur by the utilization of these metals in various industrial processes and/or contents including color pigments and alloys...
June 23, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28638301/toxic-and-essential-trace-element-content-of-commonly-administered-pediatric-oral-medications
#17
Robert A Yokel, Sarah E Seger, Jason M Unrine
OBJECTIVES: The aim of this study was to test the hypothesis that commonly administered pediatric oral medications are a significant source of toxic elements. The concentrations of 16 elements were determined in 14 frequently used pediatric oral medications. METHODS: Samples were prepared for analysis by dilution or nitric acid microwave-assisted digestion and analyzed by inductively coupled plasma mass spectrometry. The intake of each element from administration for 1 week of the medication's maximum recommended daily dose to 6-month-olds was calculated and compared to an exposure guideline for that element...
May 2017: Journal of Pediatric Pharmacology and Therapeutics: JPPT: the Official Journal of PPAG
https://www.readbyqxmd.com/read/28628796/evaluation-of-cd-cr-cu-ni-and-pb-in-selected-cosmetic-products-from-jordanian-sudanese-and-syrian-markets
#18
A M Massadeh, M Y El-Khateeb, S M Ibrahim
OBJECTIVES: There is no sufficient data that evaluate heavy metal content in cosmetic products in Jordan as well as Sudan and Syria. This study aims to assess metal levels which include Cadmium (Cd), Chromium (Cr), Copper (Cu), Nickel (Ni), and Lead (Pb) in cosmetic products. These elements have draft limits because they are identified as potential impurities and are known to be toxic. This study aims to provide information to the population that may be beneficial to public health. STUDY DESIGN: Samples were collected from different brands obtained from markets in Jordan, Sudan, and Syria...
June 16, 2017: Public Health
https://www.readbyqxmd.com/read/28624590/maleic-acid-assisted-improvement-of-metal-chelation-and-antioxidant-metabolism-confers-chromium-tolerance-in-brassica-juncea-l
#19
Jubayer Al Mahmud, Mirza Hasanuzzaman, Kamrun Nahar, Anisur Rahman, Md Shahadat Hossain, Masayuki Fujita
Chromium (Cr) is a highly toxic environmental pollutant that negatively affects plant growth and development. Thus, remediating Cr from soil or increasing plant tolerance against Cr stress is urgent. Organic acids are recognized as agents of phytoremediation and as exogenous protectants, but using maleic acid (MA) to attain these results has not yet been studied. Therefore, our study investigated the effects of MA on Cr uptake and mitigation of Cr toxicity. We treated 8-d-old Indian mustard (Brassica juncea L...
June 15, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28621547/endophytic-bacteria-enhance-remediation-of-tannery-effluent-in-constructed-wetlands-vegetated-with-leptochloa-fusca
#20
Sobia Ashraf, Muhammad Afzal, Muhammad Naveed, Muhammad Shahid, Zahir Ahmad Zahir
The use of constructed wetlands (CWs) is a promising approach for the remediation of wastewater. The present study aims to develop a plant-bacterial system within CWs for efficient remediation of tannery effluent. In a vertical flow CW vegetated with Leptochloa fusca (Kallar grass), a consortium of three different endophytic bacteria, Pantoea stewartii ASI11, Microbacterium arborescens HU33, and Enterobacter sp. HU38, was used for bioaugmentation. Constructed wetlands vegetated with only L. fusca had the potential to remediate tannery effluent, but augmentation with endophytic bacteria enhanced the growth of L...
June 16, 2017: International Journal of Phytoremediation
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